Peavey has, and still does make a bass 4x12(412TVX) They usually run 5-600....Depending on your relationship with the dealer you're talkin to...Otherwise, Aguilar does.But it's about 1200 IN BASS DWB
I have an SWR 12 stack (4x12 800 watts r.m.s.). I love this cab. It hits the lows and the mids amazingly (shook 4 broken cymbals off the hooks in my room the first time I used it ). I would highly recommend it. I got mine for $400 used they go for $700-$800 new. It is worth that much easily. The only down side is it's weight.
I maintain my opinion that I hate you for having that cab and I dont. Just kidding man....every time I look at Robbie Merrill's rig (Godsmack/SWR) I get faint.
Marshall did long ago and I think that they may be building them again. Doesn't Steve Harris use Marshall 4x12 guitar cabinets (1960 series) reloaded with EV EVM12L speakers?